My pH was around 8.5 (I know, but I wasn't testing it) I switched to RO a few days back with 1/2 nutes and 1/2 superthrive. They seem to be recovering, but I don't know. I was giving them 1/4 nutes in the beginning, but the water is so hard here, I though maybe I was getting some bad juju from the minerals. Now I adjust pH to 6.6.